gutūvya (-tūbije)   v    to make smaller, diminish (vt)
diminish    (vt) kugabanya, kugerura, kugereranya, gutūvya
(vi) kubangūra, kugabanuka, kugeruka, gutūba, kuyōka
En-En dictionary 
small    –to, –toya, –tonya, –toto
(grow smaller) gutūba
(to make smaller) gutūvya
En-En dictionary